modify entities according to NNBD models

Signed-off-by: Sahil Kumar <[email protected]>

packages/stream_chat_persistence/lib/src/entity/reactions.dart

@@ -16,10 +16,10 @@ class Reactions extends Table {
   TextColumn get type => text()();
 
   /// The DateTime on which the reaction is created
-  DateTimeColumn get createdAt => dateTime()();
+  DateTimeColumn get createdAt => dateTime().withDefault(currentDateAndTime)();
 
   /// The score of the reaction (ie. number of reactions sent)
-  IntColumn get score => integer().nullable()();
+  IntColumn get score => integer().withDefault(const Constant(0))();
 
   /// Reaction custom extraData
   TextColumn get extraData => text().nullable().map(MapConverter<Object>())();